SOLUTION: Please show me how to solve the equation using the Zero-factor property. Thanks! X^2+4x-21=0

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Please show me how to solve the equation using the Zero-factor property. Thanks! X^2+4x-21=0      Log On


   

Question 76285: Please show me how to solve the equation using the Zero-factor property. Thanks!
X^2+4x-21=0
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
X^2+4x-21=0
(x+7)(x-3)=0 [factor]
x+7=0 [set each factor equal to zero and solve]
x=-7
and
x-3=0
x=3
.
check by plugging in each value for x and solve.